1. Measurements of Natural Carbonate Rare Earth Elements in Femtogram Quantities by Inductive Coupled Plasma Sector Field Mass Spectrometry Shen, Chuan-Chou; Wu, Chung-Che; Liu, Yi; Yu, Jimin; Chang, Ching-Chih; Lam, Doan Dinh; Chou, Chien-Ju; Lo, Li; Wei, Kuo-Yen 2011 Articles Paleoclimatology